drivers/s390/scsi/zfcp_ccw.c

   1 /*
   2  * linux/drivers/s390/scsi/zfcp_ccw.c
   3  *
   4  * FCP adapter driver for IBM eServer zSeries
   5  *
   6  * CCW driver related routines
   7  *
   8  * (C) Copyright IBM Corp. 2003, 2004
   9  *
  10  * Authors:
  11  *      Martin Peschke <mpeschke@de.ibm.com>
  12  *      Heiko Carstens <heiko.carstens@de.ibm.com>
  13  *      Andreas Herrmann <aherrman@de.ibm.com>
  14  *
  15  * This program is free software; you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License as published by
  17  * the Free Software Foundation; either version 2, or (at your option)
  18  * any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, write to the Free Software
  27  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  28  */
  29
  30 #define ZFCP_CCW_C_REVISION "$Revision: 1.58 $"
  31
  32 #include "zfcp_ext.h"
  33
  34 #define ZFCP_LOG_AREA                   ZFCP_LOG_AREA_CONFIG
  35
  36 static int zfcp_ccw_probe(struct ccw_device *);
  37 static void zfcp_ccw_remove(struct ccw_device *);
  38 static int zfcp_ccw_set_online(struct ccw_device *);
  39 static int zfcp_ccw_set_offline(struct ccw_device *);
  40 static int zfcp_ccw_notify(struct ccw_device *, int);
  41 static void zfcp_ccw_shutdown(struct device *);
  42
  43 static struct ccw_device_id zfcp_ccw_device_id[] = {
  44         {CCW_DEVICE_DEVTYPE(ZFCP_CONTROL_UNIT_TYPE,
  45                             ZFCP_CONTROL_UNIT_MODEL,
  46                             ZFCP_DEVICE_TYPE,
  47                             ZFCP_DEVICE_MODEL)},
  48         {CCW_DEVICE_DEVTYPE(ZFCP_CONTROL_UNIT_TYPE,
  49                             ZFCP_CONTROL_UNIT_MODEL,
  50                             ZFCP_DEVICE_TYPE,
  51                             ZFCP_DEVICE_MODEL_PRIV)},
  52         {},
  53 };
  54
  55 static struct ccw_driver zfcp_ccw_driver = {
  56         .owner       = THIS_MODULE,
  57         .name        = ZFCP_NAME,
  58         .ids         = zfcp_ccw_device_id,
  59         .probe       = zfcp_ccw_probe,
  60         .remove      = zfcp_ccw_remove,
  61         .set_online  = zfcp_ccw_set_online,
  62         .set_offline = zfcp_ccw_set_offline,
  63         .notify      = zfcp_ccw_notify,
  64         .driver      = {
  65                 .shutdown = zfcp_ccw_shutdown,
  66         },
  67 };
  68
  69 MODULE_DEVICE_TABLE(ccw, zfcp_ccw_device_id);
  70
  71 /**
  72  * zfcp_ccw_probe - probe function of zfcp driver
  73  * @ccw_device: pointer to belonging ccw device
  74  *
  75  * This function gets called by the common i/o layer and sets up the initial
  76  * data structures for each fcp adapter, which was detected by the system.
  77  * Also the sysfs files for this adapter will be created by this function.
  78  * In addition the nameserver port will be added to the ports of the adapter
  79  * and its sysfs representation will be created too.
  80  */
  81 static int
  82 zfcp_ccw_probe(struct ccw_device *ccw_device)
  83 {
  84         struct zfcp_adapter *adapter;
  85         int retval = 0;
  86
  87         down(&zfcp_data.config_sema);
  88         adapter = zfcp_adapter_enqueue(ccw_device);
  89         if (!adapter)
  90                 retval = -EINVAL;
  91         else
  92                 ZFCP_LOG_DEBUG("Probed adapter %s\n",
  93                                zfcp_get_busid_by_adapter(adapter));
  94         up(&zfcp_data.config_sema);
  95         return retval;
  96 }
  97
  98 /**
  99  * zfcp_ccw_remove - remove function of zfcp driver
 100  * @ccw_device: pointer to belonging ccw device
 101  *
 102  * This function gets called by the common i/o layer and removes an adapter
 103  * from the system. Task of this function is to get rid of all units and
 104  * ports that belong to this adapter. And in addition all resources of this
 105  * adapter will be freed too.
 106  */
 107 static void
 108 zfcp_ccw_remove(struct ccw_device *ccw_device)
 109 {
 110         struct zfcp_adapter *adapter;
 111         struct zfcp_port *port, *p;
 112         struct zfcp_unit *unit, *u;
 113
 114         ccw_device_set_offline(ccw_device);
 115         down(&zfcp_data.config_sema);
 116         adapter = dev_get_drvdata(&ccw_device->dev);
 117
 118         ZFCP_LOG_DEBUG("Removing adapter %s\n",
 119                        zfcp_get_busid_by_adapter(adapter));
 120         write_lock_irq(&zfcp_data.config_lock);
 121         list_for_each_entry_safe(port, p, &adapter->port_list_head, list) {
 122                 list_for_each_entry_safe(unit, u, &port->unit_list_head, list) {
 123                         list_move(&unit->list, &port->unit_remove_lh);
 124                         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE,
 125                                         &unit->status);
 126                 }
 127                 list_move(&port->list, &adapter->port_remove_lh);
 128                 atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &port->status);
 129         }
 130         atomic_set_mask(ZFCP_STATUS_COMMON_REMOVE, &adapter->status);
 131         write_unlock_irq(&zfcp_data.config_lock);
 132
 133         list_for_each_entry_safe(port, p, &adapter->port_remove_lh, list) {
 134                 list_for_each_entry_safe(unit, u, &port->unit_remove_lh, list) {
 135                         zfcp_unit_dequeue(unit);
 136                 }
 137                 zfcp_port_dequeue(port);
 138         }
 139         zfcp_adapter_wait(adapter);
 140         zfcp_adapter_dequeue(adapter);
 141
 142         up(&zfcp_data.config_sema);
 143 }
 144
 145 /**
 146  * zfcp_ccw_set_online - set_online function of zfcp driver
 147  * @ccw_device: pointer to belonging ccw device
 148  *
 149  * This function gets called by the common i/o layer and sets an adapter
 150  * into state online. Setting an fcp device online means that it will be
 151  * registered with the SCSI stack, that the QDIO queues will be set up
 152  * and that the adapter will be opened (asynchronously).
 153  */
 154 static int
 155 zfcp_ccw_set_online(struct ccw_device *ccw_device)
 156 {
 157         struct zfcp_adapter *adapter;
 158         int retval;
 159
 160         down(&zfcp_data.config_sema);
 161         adapter = dev_get_drvdata(&ccw_device->dev);
 162
 163         retval = zfcp_adapter_debug_register(adapter);
 164         if (retval)
 165                 goto out;
 166         retval = zfcp_erp_thread_setup(adapter);
 167         if (retval) {
 168                 ZFCP_LOG_INFO("error: start of error recovery thread for "
 169                               "adapter %s failed\n",
 170                               zfcp_get_busid_by_adapter(adapter));
 171                 goto out_erp_thread;
 172         }
 173
 174         retval = zfcp_adapter_scsi_register(adapter);
 175         if (retval)
 176                 goto out_scsi_register;
 177         zfcp_erp_modify_adapter_status(adapter, ZFCP_STATUS_COMMON_RUNNING,
 178                                        ZFCP_SET);
 179         zfcp_erp_adapter_reopen(adapter, ZFCP_STATUS_COMMON_ERP_FAILED);
 180         zfcp_erp_wait(adapter);
 181         goto out;
 182
 183  out_scsi_register:
 184         zfcp_erp_thread_kill(adapter);
 185  out_erp_thread:
 186         zfcp_adapter_debug_unregister(adapter);
 187  out:
 188         up(&zfcp_data.config_sema);
 189         return retval;
 190 }
 191
 192 /**
 193  * zfcp_ccw_set_offline - set_offline function of zfcp driver
 194  * @ccw_device: pointer to belonging ccw device
 195  *
 196  * This function gets called by the common i/o layer and sets an adapter
 197  * into state offline. Setting an fcp device offline means that it will be
 198  * unregistered from the SCSI stack and that the adapter will be shut down
 199  * asynchronously.
 200  */
 201 static int
 202 zfcp_ccw_set_offline(struct ccw_device *ccw_device)
 203 {
 204         struct zfcp_adapter *adapter;
 205         struct zfcp_port *port;
 206         struct fc_rport *rport;
 207
 208         down(&zfcp_data.config_sema);
 209         adapter = dev_get_drvdata(&ccw_device->dev);
 210         /* might be racy, but we cannot take config_lock due to the fact that
 211            fc_remote_port_delete might sleep */
 212         list_for_each_entry(port, &adapter->port_list_head, list)
 213                 if (port->rport) {
 214                         rport = port->rport;
 215                         port->rport = NULL;
 216                         fc_remote_port_delete(rport);
 217                 }
 218         zfcp_erp_adapter_shutdown(adapter, 0);
 219         zfcp_erp_wait(adapter);
 220         zfcp_adapter_scsi_unregister(adapter);
 221         zfcp_erp_thread_kill(adapter);
 222         zfcp_adapter_debug_unregister(adapter);
 223         up(&zfcp_data.config_sema);
 224         return 0;
 225 }
 226
 227 /**
 228  * zfcp_ccw_notify
 229  * @ccw_device: pointer to belonging ccw device
 230  * @event: indicates if adapter was detached or attached
 231  *
 232  * This function gets called by the common i/o layer if an adapter has gone
 233  * or reappeared.
 234  */
 235 static int
 236 zfcp_ccw_notify(struct ccw_device *ccw_device, int event)
 237 {
 238         struct zfcp_adapter *adapter;
 239
 240         down(&zfcp_data.config_sema);
 241         adapter = dev_get_drvdata(&ccw_device->dev);
 242         switch (event) {
 243         case CIO_GONE:
 244                 ZFCP_LOG_NORMAL("adapter %s: device gone\n",
 245                                 zfcp_get_busid_by_adapter(adapter));
 246                 debug_text_event(adapter->erp_dbf,1,"dev_gone");
 247                 zfcp_erp_adapter_shutdown(adapter, 0);
 248                 break;
 249         case CIO_NO_PATH:
 250                 ZFCP_LOG_NORMAL("adapter %s: no path\n",
 251                                 zfcp_get_busid_by_adapter(adapter));
 252                 debug_text_event(adapter->erp_dbf,1,"no_path");
 253                 zfcp_erp_adapter_shutdown(adapter, 0);
 254                 break;
 255         case CIO_OPER:
 256                 ZFCP_LOG_NORMAL("adapter %s: operational again\n",
 257                                 zfcp_get_busid_by_adapter(adapter));
 258                 debug_text_event(adapter->erp_dbf,1,"dev_oper");
 259                 zfcp_erp_modify_adapter_status(adapter,
 260                                                ZFCP_STATUS_COMMON_RUNNING,
 261                                                ZFCP_SET);
 262                 zfcp_erp_adapter_reopen(adapter,
 263                                         ZFCP_STATUS_COMMON_ERP_FAILED);
 264                 break;
 265         }
 266         zfcp_erp_wait(adapter);
 267         up(&zfcp_data.config_sema);
 268         return 1;
 269 }
 270
 271 /**
 272  * zfcp_ccw_register - ccw register function
 273  *
 274  * Registers the driver at the common i/o layer. This function will be called
 275  * at module load time/system start.
 276  */
 277 int __init
 278 zfcp_ccw_register(void)
 279 {
 280         int retval;
 281
 282         retval = ccw_driver_register(&zfcp_ccw_driver);
 283         if (retval)
 284                 goto out;
 285         retval = zfcp_sysfs_driver_create_files(&zfcp_ccw_driver.driver);
 286         if (retval)
 287                 ccw_driver_unregister(&zfcp_ccw_driver);
 288  out:
 289         return retval;
 290 }
 291
 292 /**
 293  * zfcp_ccw_unregister - ccw unregister function
 294  *
 295  * Unregisters the driver from common i/o layer. Function will be called at
 296  * module unload/system shutdown.
 297  */
 298 void __exit
 299 zfcp_ccw_unregister(void)
 300 {
 301         zfcp_sysfs_driver_remove_files(&zfcp_ccw_driver.driver);
 302         ccw_driver_unregister(&zfcp_ccw_driver);
 303 }
 304
 305 /**
 306  * zfcp_ccw_shutdown - gets called on reboot/shutdown
 307  *
 308  * Makes sure that QDIO queues are down when the system gets stopped.
 309  */
 310 static void
 311 zfcp_ccw_shutdown(struct device *dev)
 312 {
 313         struct zfcp_adapter *adapter;
 314
 315         down(&zfcp_data.config_sema);
 316         adapter = dev_get_drvdata(dev);
 317         zfcp_erp_adapter_shutdown(adapter, 0);
 318         zfcp_erp_wait(adapter);
 319         up(&zfcp_data.config_sema);
 320 }
 321
 322 #undef ZFCP_LOG_AREA